remove 'widows' property because paged media support is gone so this does nothing now

sky/engine/core/css/resolver/AnimatedStyleBuilder.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 439 matching lines @@
         style->setTransform(operations.size() ? operations : TransformOperations(true));
         return;
     }
     case CSSPropertyTransformOrigin: {
         const AnimatableLengthPoint3D* animatableLengthPoint3D = toAnimatableLengthPoint3D(value);
         style->setTransformOriginX(animatableValueToLength(animatableLengthPoint3D->x(), state));
         style->setTransformOriginY(animatableValueToLength(animatableLengthPoint3D->y(), state));
         style->setTransformOriginZ(clampTo<float>(toAnimatableDouble(animatableLengthPoint3D->z())->toDouble()));
         return;
     }
-    case CSSPropertyWidows:
-        style->setWidows(animatableValueRoundClampTo<unsigned short>(value, 1));
-        return;
     case CSSPropertyWidth:
         style->setWidth(animatableValueToLength(value, state, ValueRangeNonNegative));
         return;
     case CSSPropertyWordSpacing:
         style->setWordSpacing(clampTo<float>(toAnimatableDouble(value)->toDouble()));
         return;
     case CSSPropertyVerticalAlign:
         style->setVerticalAlignLength(animatableValueToLength(value, state));
         return;
     case CSSPropertyZIndex:
         style->setZIndex(animatableValueRoundClampTo<unsigned>(value));
         return;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink